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Nematic topological defects positionally controlled by geometry and external fields.

Pavlo Kurioz1, Marko Kralj2, Bryce S Murray3

  • 1Jozef Stefan International Postgraduate School, Jamova 39 , 1000 Ljubljana, Slovenia.

Beilstein Journal of Nanotechnology
|February 15, 2018
PubMed
Summary
This summary is machine-generated.

We investigated how confinement and fields affect nematic topological defects (TDs). A confinement charge greater than 1/2 breaks down into 1/2 charge TDs, enabling uniform ordering and potential nanoparticle trapping.

Keywords:
nanoparticlesnematic liquid crystalstopological chargetopological defects

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Area of Science:

  • Soft Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Nematic topological defects (TDs) are crucial in understanding liquid crystal behavior.
  • Their spatial arrangement is influenced by system geometry and external stimuli.
  • Controlling TD positioning is key for developing advanced materials and devices.

Purpose of the Study:

  • To investigate the impact of confinement topology, geometry, and external fields on nematic TD positioning.
  • To explore how confinement-enforced topological charge influences defect behavior.
  • To demonstrate potential applications of TD assemblies in nanotechnology.

Main Methods:

  • Utilized a Landau-de Gennes theoretical approach.
  • Studied quasi two-dimensional systems with varying confinement characteristics.
  • Analyzed the effects of external electric fields on TD behavior.

Main Results:

  • Demonstrated that confinement-enforced topological charge (m > 1/2) decays into elementary TDs (m = 1/2).
  • Observed that TDs assemble near substrates, promoting bulk-like nematic ordering.
  • Showed that order parameter correlation length can induce global TD rotation and electric fields can manipulate TD positions.

Conclusions:

  • Confinement topology and external fields offer precise control over nematic TD organization.
  • TD assemblies can be engineered for specific functions, such as nanoparticle trapping.
  • This research opens avenues for creating novel functional nanodevices.